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  2. Trigonometric functions - Wikipedia

    en.wikipedia.org/wiki/Trigonometric_functions

    Basis of trigonometry: if two right triangles have equal acute angles, they are similar, so their corresponding side lengths are proportional.. In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) [1] are real functions which relate an angle of a right-angled triangle to ratios of two side lengths.

  3. Distillation - Wikipedia

    en.wikipedia.org/wiki/Distillation

    Continuous distillation produces a minimum of two output fractions, including at least one volatile distillate fraction, which has boiled and been separately captured as a vapor and then condensed to a liquid. There is always a bottoms (or residue) fraction, which is the least volatile residue that has not been separately captured as a ...

  4. Chemistry - Wikipedia

    en.wikipedia.org/wiki/Chemistry

    Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.

  5. Climate change in New Zealand - Wikipedia

    en.wikipedia.org/wiki/Climate_change_in_New_Zealand

    A report released by the Productivity Commission in August 2018 also found that one billion tree plan is only a fraction of what is required to offset the amount carbon being released in New Zealand. The Commission says the planting rate needs to double, from 50,000 hectares to 100,000ha per year and the length of the programme needs to be ...